MACS 609 CERTIFICATION Questions And
Answers With Verified Solutions 100%
Correct Latest Update.
Q1. If recovery equipment takes lubricant out during refrigerant removal, what should be
done?
A1. The removed lubricant must be put back into the system.
Q2. Before reusing HFC-134a that’s been recovered from a mobile A/C system with
recovery-only equipment, what is required?
A2. The refrigerant must be recycled with certified equipment before reuse.
Q3. Under what condition can HFC-134a become flammable in a mobile A/C system?
A3. If shop air is introduced into the system while HFC-134a is present.
Q4. Which mobile A/C system design typically requires extra time and precautions to fully
recover refrigerant?
A4. Systems with an accumulator.
Q5. What is the detection capability of SAE J2791-certified electronic leak detectors?
A5. They can identify leaks as small as 0.15 ounces per year.
Q6. How much lubricant is usually removed during refrigerant recovery with
recovery/recycling equipment?
A6. Typically, very little, if any.
Q7. Why is it important that service port caps with good seals are installed?
A7. To prevent refrigerant leakage.
Q8. What is true about flushing A/C systems?
A8. Solvent residue from flushing can remain and cause issues.
Q9. After the first refrigerant recovery, how long should you wait before checking the
recovery machine’s gauges for pressure rise above vacuum?
A9. Wait 5 minutes to ensure no refrigerant remains.
Q10. What type of tank must be used for refrigerant transfer?
A10. Tanks marked as DOT 4BA.
Q11. If an A/C system is found to have low refrigerant, what should be done?
A11. A leak test must be performed.
Q12. What is one environmental effect of some refrigerant gases?
A12. They contribute to heat retention in the atmosphere.
Q13. What happens if CFC-12 and HFC-134a are mixed in the same system?
A13. It results in cross-contamination of refrigerants.
Q14. How much moisture is generally removed during standard evacuation of a mobile A/C
system?
A14. Possibly none.
Answers With Verified Solutions 100%
Correct Latest Update.
Q1. If recovery equipment takes lubricant out during refrigerant removal, what should be
done?
A1. The removed lubricant must be put back into the system.
Q2. Before reusing HFC-134a that’s been recovered from a mobile A/C system with
recovery-only equipment, what is required?
A2. The refrigerant must be recycled with certified equipment before reuse.
Q3. Under what condition can HFC-134a become flammable in a mobile A/C system?
A3. If shop air is introduced into the system while HFC-134a is present.
Q4. Which mobile A/C system design typically requires extra time and precautions to fully
recover refrigerant?
A4. Systems with an accumulator.
Q5. What is the detection capability of SAE J2791-certified electronic leak detectors?
A5. They can identify leaks as small as 0.15 ounces per year.
Q6. How much lubricant is usually removed during refrigerant recovery with
recovery/recycling equipment?
A6. Typically, very little, if any.
Q7. Why is it important that service port caps with good seals are installed?
A7. To prevent refrigerant leakage.
Q8. What is true about flushing A/C systems?
A8. Solvent residue from flushing can remain and cause issues.
Q9. After the first refrigerant recovery, how long should you wait before checking the
recovery machine’s gauges for pressure rise above vacuum?
A9. Wait 5 minutes to ensure no refrigerant remains.
Q10. What type of tank must be used for refrigerant transfer?
A10. Tanks marked as DOT 4BA.
Q11. If an A/C system is found to have low refrigerant, what should be done?
A11. A leak test must be performed.
Q12. What is one environmental effect of some refrigerant gases?
A12. They contribute to heat retention in the atmosphere.
Q13. What happens if CFC-12 and HFC-134a are mixed in the same system?
A13. It results in cross-contamination of refrigerants.
Q14. How much moisture is generally removed during standard evacuation of a mobile A/C
system?
A14. Possibly none.
